In addition to his New York based projects, he has toured Europe extensively since 1993 with Wolfgang Lackerschmid along with John Lee, Cameron Brown, Belden Bullock, Georg Wadenius, Ed Cherry, Michal Urbaniak, Attila Zoller and numerous other musicians. Karl and bassist Kermit Driscoll joined the Johannes Mossinger NY Trio in 2001 and has appeared on numerous tours as well as three recrdings with the group, special guests include Joe Lovano, Torsten de Winkel and John Lee. A new release is due out in 2005 with guest Bob Malach.

Karl recieved a B.S.S. from Ohio University and studied music performance at Rutgers University, Ohio University and Berklee College of Music. Karl's formal musical training includes private lessons with Gary Chester, Freddy Waits, Michael Carvin, Joe Morello, Joe Cusatis and Muzzy Mizzioni.
While in college, Karl won second place in the 1983 Carmine Appice National Drum Battle.

Karl currently resides and teaches private lessons in the northwest New Jersey area. He is an Adjunct Professor at Passaic Community College. Karl regularly teaches master classes in Germany.